> For the complete documentation index, see [llms.txt](https://docs.buildingtransparency.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.buildingtransparency.org/ec3/main-features/plan-and-compare-buildings/units-of-measure.md).

# Units of Measure

Detailed list of measurement units accepted for each product category in EC3, see [here](https://docs.google.com/spreadsheets/d/19WYnuZrlVfuyd4SBZOgKv-iySRKR2IKq/edit#gid=120161577). The following is a summary of the main units in their respective dimensions.

{% hint style="warning" %}
When it comes to units of **tons**, EC3 differentiates SI and USA units in the following way:

* SI, i.e., metric ton:    t, tonne, metric ton
* USA, i.e., short ton:    ton, short ton
  {% endhint %}

<table><thead><tr><th width="279">Dimensionality</th><th>Unit of Measure that EC3 will accept and understand</th></tr></thead><tbody><tr><td>Unit</td><td>item, ea, pc, unit, piece, doz</td></tr><tr><td>Mass</td><td>g, kg, t, tonne,<br>lb, lbs, ton, short_ton, oz</td></tr><tr><td>Length</td><td>in, ft, yd, yds, inch, mil, mi,<br>inch, foot, feet, mile, miles,<br>km, m, cm, mm...</td></tr><tr><td>Area</td><td>sy, sqyd, yd2<br>sf, sqft, ft2,<br>sqin, in2<br>km2, m2, cm2, mm2...</td></tr><tr><td>Volume</td><td>cf, cuft, ft3,<br>cy, cuyd, yd3,<br>cuin, in3,<br>bf, mbf, mmbf,<br>L, gal<br>km3, m3, cm3, mm3...</td></tr><tr><td>Pressure</td><td>MPa, GPa, Pa, TPa...<br>psi, ksi</td></tr><tr><td>Power</td><td>kW, MW, W, kilowatt, watt, megawatt</td></tr><tr><td>Energy</td><td>J, MJ and all metric prefixes,<br>kWh, Wh, and all metric prefixes.<br>Btu, kBtu, MBtu<br>scf</td></tr><tr><td>mass * distance</td><td>tkm, tmi</td></tr><tr><td>area * thermal resistivity</td><td>ft2 RSI, m2 RSI, r_value</td></tr></tbody></table>